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Planar Wide-Angle Imaging System with a Single-Layer SiC Metalens.

Yiyang Liu1, Qiangbo Zhang1, Changwei Zhang1

  • 1College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Nanomaterials (Basel, Switzerland)
|July 12, 2025
PubMed
Summary

Researchers developed a single-layer silicon carbide metalens with a 90° field-of-view (FOV) for compact imaging systems. This novel metalens overcomes integration challenges, enabling wide-angle imaging for applications like endoscopy.

Keywords:
imagingmetalensmetasurfaceswide field of view

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Wide field-of-view (FOV) optical systems are essential for diverse applications, including biomedical diagnostics and remote sensing.
  • Conventional wide-angle optics present integration difficulties in compact devices.

Purpose of the Study:

  • To design and experimentally demonstrate a single-layer silicon carbide (SiC) metalens with a 90° total FOV.
  • To address the integration challenges of wide-angle optics in compact platforms.

Main Methods:

  • Utilized a gradient-based numerical optimization strategy, Gradient-Optimized Phase Profile Shaping (GOPP), to optimize the metalens phase profile.
  • Incorporated a front aperture for off-axis aberration control within the planar metalens structure.

Main Results:

  • Successfully fabricated a single-layer SiC metalens with a 90° FOV operating at 803 nm.
  • Demonstrated effective wide-angle imaging with focusing capabilities across the entire FOV.
  • Achieved a focal length of 1 mm and a numerical aperture (NA) of 0.25.

Conclusions:

  • Numerical optimization is feasible for creating single-layer metalenses with challenging wide FOV capabilities.
  • The developed metalens offers a promising solution for highly compact imagers in fields like endoscopy and dermoscopy.